I think that on the whole it is a lost cause because most of the general public are genuinely not interested in objects that are so remote from life as they know it. They are also put off by the sensationalisation of the more spectaciular gee whizz bits. Something genuinlely showing the scale and grandeur of the normal bits and the sedate development of things and explaining clearly the chains of measurements that allow us to speak of this with a degree of confidence might just help a bit.